[PATCH v6] i2c: imx: support DMA defer probing

[Andi Shyti]

Hi Carlos,

...

> @@ -1802,6 +1803,18 @@ static int i2c_imx_probe(struct platform_device *pdev)
>  	if (ret == -EPROBE_DEFER)
>  		goto clk_notifier_unregister;
>  
> +	/* As we can always fall back to PIO, let's ignore the error setting up DMA. */
> +	ret = i2c_imx_dma_request(i2c_imx, phy_addr);
> +	if (ret) {
> +		if (ret == -EPROBE_DEFER)
> +			goto clk_notifier_unregister;
> +		else if (ret == -ENODEV)
> +			dev_dbg(&pdev->dev, "Only use PIO mode\n");
> +		else
> +			dev_err(&pdev->dev, "Failed to setup DMA (%pe), only use PIO mode\n",
> +				ERR_PTR(ret));

My question here is not just about the use of dev_err vs
dev_err_probe, but why don't we exit the probe if we get an
error.

We should use PIO only in case of ENODEV, in all the other cases
I think we should just leave. E.g. why don't we exit if we meet
ret == -ENOMEM?

Andi